[Q] SMS Backup (Lumia 800)

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http://forum.xda-developers.com – Hey guys, I currently have a "@gmail.com" Microsoft-Account and I would like to change that to a "@outlook.com" Account. For that reason, I have to reset my Lumia 800, because you can't change the mail address of the Microsoft Account, that is linked to Windows Phone, on the phone. I have no problem with resetting my phone, I just want to keep my texts. Is there a way of just backing up your texts and then restoring it on the "fresh phone"? My phone is developer unlocked: Model: Nokia Lumia 800 OS version: 7.10.8773.98 Firmware revision: 1750.0805.8773. (HowTos)